How is safety ensured?
Because placement accuracy of the shots is critical to localization of the radiation (to the fraction of a millimeter) anything that would degrade this precision is unacceptable. Rigid attachment of the headframe, geographic targeting accuracy of the MRI, shaping of the volume of tissue to be treated (selection of the number, size and relative intensity of the shots) and accuracy of attachment of the frame to the gamma knife unit are all critical. As is true of all radiation therapy, correct selection and calculation of the amount of radiation to deliver are essential. A qualified medical physicist assures that the imaging and treatment planning computers and software are correct and acceptable. The mechanical functions of the machine are tested on a regular basis to ensure the safety of patients and medical staff.
